In Windows , we can pass the message using CWnd::Attach() method whenever we wants to pass the message getting attach to CWnd object.
Is similar method available in QNX…???
In Other words, is there any class which do the same functionality as CWnd in QNX???
Check out the QNX IPC template class. It has similar functionality (more sophisticated actually, since it offers a degree of type safety in the messaging via template meta-programming).
I think the message passing mention by the OP had nothing to do with the QNX message passing. It’s more like how photon event transmited inside the widget hierarchy.
That beind said I thing Wednesday is mistaking in thinking in MFC term and should instead learn how QNX works instead of trying to finding equivalent feature set.